US Bridges

Nh 11 over Cascade Brook

Fair

Merrimack County, New Hampshire · 1.7 MI from New London Tl · Structure no. 027502010011500

Built
1960
65 years old, rebuilt 1985
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
53 ft
1 main span
Daily traffic
5,115
2023 count
Owner
State
State Highway Agency

About this bridge

Nh 11 over Cascade Brook is a steel stringer/multi-beam or girder carrying Nh 11 over Cascade Brook in Merrimack County, New Hampshire. It was built in 1960 and reconstructed in 1985, so it is 65 years old, older than the New Hampshire average of 56.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 5,115 vehicles a day, roughly 7% of them trucks, projected to reach 7,570 by 2043. The structure is 53 ft (16.2 m) long and 48 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesNh 11
CrossesCascade Brook
Location1.7 MI from New London Tl
RouteState Highway 11
CountyMerrimack County
StateNew Hampshire
Coordinates43.4148, -71.89977
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55.4 US tons
Inventory rating33.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length53 ft (16.2 m)
Longest span49 ft (14.9 m)
Deck width48 ft (14.5 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,115 (2023)
Projected traffic7,570 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$314,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nh 11 over Cascade Brook built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 1985.

What condition is Nh 11 over Cascade Brook in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in April 2024.

How much traffic does Nh 11 over Cascade Brook carry?

About 5,115 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Nh 11 over Cascade Brook?

The structure is 53 ft (16.2 m) long with a longest span of 49 ft (14.9 m) and a deck 48 ft wide.

Who owns Nh 11 over Cascade Brook?

It is owned by the State Highway Agency.